Portable grinding-mill



(No Model.) 2 sheets-sheen 1..

. J. MOLE.

PORTABLE GRINDING-MILL.

Patented Jan; 31,

I 2 Shelats-ESheet 2. J. G. MOLE; PORTABLE GRINDING MILL, I

Patented J an. 31,- 1893.

(No M deI.)

UNiT STATES ATENT Erica.

JOHN G. MOLE, OF BATAVIA, ILLINOIS.

PORTABLE GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 490,812 dated January 31, 1893.

Application filed December 16, 1891- Serial No. 415.311. (No model.)

To all whom, it may concern:

Be it known that I, JOHN G. MOLE, a citizen of the United States, residing at Batavia, in the county of Kane and State of Illinois, have invented certain new and useful Improvements in Portable Grinding-Mills, of which the following is a full, clear, and exact descripgoverning device.

tion,-that will enable others to make and use the same, reference being had to the accom panying drawings, forming a part of this specification, in which- Figure 1 is a side elevation and part section. Fig. 2 an inside view of a part of a Fig. 3 a similar view of the governor-disk; the driving-shaft being shown in section. Fig. 4 a vertical longitudinal section on line 4, Figs. 2 and 3,1ooking in the direction indicated by the arrow; the two parts being united. Fig. 5 a broken-away vertical transverse section on line 5, Fig. 1.. Fig. 6, a vertical transverse section-on line 6, Fig. 1, looking in the direction indicated by the arrow; and Fig. 7 abroken-away part plan and part section.

This invention relates to improvements in portable grinding or feed-mills, and consists of certain novel features in the construction, combination and arrangement of the difierent parts, as will be hereinafter set forth.

Referring to the drawings, A represents the diiferent parts of the supporting-frame, B the driving or mill shaft, and B the fiy-wheel mounted thereon. The driving-shaft is provided with suitable journal-bearings in the top of the supporting-frame, as shown in Fig. 1.

The grinding-rings, O O are inclosed in the circular box, 0 The ring Ois stationary and rigidly secured to the back side of the inclosing-box. (Figs. 1 and 7.) The runner or ring 0' is mounted on the sleeve D, which is in turn rigidly mounted on the driving-shaft. The rear part of the sleeve D extending into the feed-chamber at below the hopper D is provided with a number of spiral ribs a (Figs. 1 and 6). forming a screw-feed. This spiral or screw arrangement insures a continuous feed and prevents choking or clogging in the feed-chamber; one half of the screw-part beof said lever.

this slide is of a semicircular form (Fig. 6). and project-s into the feed-passage just over the spiral feed. To the opposite end of the feed-slide is connected one end of the rod ta The other end of this rod is connected to the lever F, shown in Figs. 1 and 5. The lower end of this lever is pivoted to the frame as at a thus providing for a reciprocating movement of the upper end and imparting a corresponding movement to the slide in regulating the feed.

The centrifugal shaft-governor will now be described. This consists of the chambered disk, G, rigidly mounted on the driving-shaft. A number of curved arms, H, have their inner ends pivoted, as at a, to said disk and are arranged at equidistant points with reference to each other and the axis of rotation, as shown in Fig. 3. The conical cap, J, is loosely mounted on the driving-shaft and has its hub-end,

b, resting in thefork or seat I) of thelever F,

which bear against the interior conical surface of the cap, as shown in Fig. 4. The surface of the arms having contact are beveled,

as at b tocorrespond to the bearing-surface of the cap. This cap has an endwise movement on the driving-shaft, but does not rotate therewith; this being prevented by the pin 17 hearing against one side of the lever F, (Fig. 5). and the companion pin b engaging with the underside of the curved extension b The companion pins are rigid parts of the cap. One end of the spiral-spring b is connected to the hopper-part, and the opposite end hooked around the lever F. This lever is provided with a number of notches If, so that the connecting end of the.

spring may be raised or lowered in regulating the tension with reference to the throw of the lever and the distance that the feed-plate is to be moved.

In operation, the centrifugal action ofthe governor-arms forces the inclosing-cap backward therefrom, which movement has the effect of inclining the upper end of the notched lever, F, in the same direction, thus drawing back the feed-slide and enlarging the passage from the hopper into the feed-chamber. As the flow of grain from the hopper becomes too TCO great, the speed will thereby be checked and the force of the governor-arms diminished so that the spring b will draw the lever F in the opposite direction bringing the governor members together and moving the feed-slide to partially close the passage from the hopper, and thereby automatically regulate the feed supply. The shelf at in the bottom of the hopper narrows the passage and carries the matter being ground toward the opening in advance of the feed-slide. The screw-spiral always insures a continuous and regular feed in accordance with the speed of the drivingshaft. When the feed-plate is in its normal position, the passage between the hopper and grinding-rings is closed. The spring Z9 serves to draw the lever F back and hold the feedplate in that position.

One end of the curved bridge-tree-bearing, K, is pivoted, at cl, to the frame; the opposite end being adjustably secured to the frame, on the opposite side, by means of the screw-stud h and the hand-nut h, as shown in Fig. '7. The conical point 9 projects inwardly from the bridge and bears against the end of the driving-shaft. By this arrangement the proper relative distance between the faces of the grinding-disks is adjustably maintained as the work may require. The spring I) also serves the purpose of holding the driving-shaft against the bridge-tree, thereby preventing the grinding-rings from rubbing together.

L is the spout through which the ground I product is discharged.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is:-

1. In a grinding mill, the combination of the feed slide projecting in the feed passage between thehopper and grinding rings, a governor connected to said slide for imparting an endwise movement thereto for regulating the feed in accordance with the speed of the grinding mechanism, and an auxiliary shelf 01 in the hopper above the feed slide for carrying the contents toward the opening made by said feed slide, substantially as set forth.

2. In a grinding-mill,the combination with the driving or mill-shaft, of a governing device, consisting of a chambered disk, rigidly mounted on said shaft, a number of curved arms, pivoted to said disk, a conical cap, loosely mounted and having an endwise movement on said shaft and adapted to inclose said arms, a lever, to which the governor-cap is attached, and a spring connected to said lever, substantially as set forth.

3. In a grinding-mill, the combination of the pivoted lever F, provided with the curved extension b of the conical governor-eap,provided with the pins b b, substantially as set forth.

4. In a grinding mill the combination with the driving shaft, an adjustable bridge tree therefor, a feed slide, and a governing device, for controlling said feed slide, of the spring 1) operating to retract the feed slide and to force the driving shaft against the bridge tree, substantially as set forth.

JOHN G. MOLE.

Witnesses:

L. M. FREEMAN, J. B. DONALSON. 

